/Engine/Source/Editor/UnrealEd/Classes/Editor/EditorEngine.h
Sets up for a potentially deferred ConvertActors call, based on if any brushes are being converted to a static mesh. If one (or more) are being converted, the user will need to put in a package before the process continues.
void ConvertActors ( const [TArray](API\Runtime\Core\Containers\TArray)< [AActor](API\Runtime\Engine\GameFramework\AActor) * > & ActorsToConvert, [UClass](API\Runtime\CoreUObject\UObject\UClass) * ConvertToClass, const [TSet](API\Runtime\Core\Containers\TSet)< [FString](API\Runtime\Core\Containers\FString) > & ComponentsToConsider, bool bUseSpecialCases )